The Wild Thornberrys (1998)

S2E16 Reef Grief

Eliza takes on more than she can manage and quickly finds herself overwhelmed. When Nigel finds himself in trouble, clumsily struggling in the water, she has no choice but to gear up for a dive. With the stakes high, she plunges into the perilous Australian waters to save him and the flipping commvee, facing unexpected challenges along the way.